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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.5K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.5K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.0K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

8.3K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
1.9K
Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

7.1K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.1K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K

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Updated: Jun 5, 2025

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

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アロマティック・リング・オープニング・メタテシス

Valeriia Hutskalova1, Christof Sparr2

  • 1Department of Chemistry, University of Basel, Basel, Switzerland.

Nature
|December 11, 2024
PubMed
まとめ
この要約は機械生成です。

研究者は,安定したアロマティックな炭素-炭素結合を裂くために,アロマティック・リング・オープニング・メタテシス (ArROM) を開発した. この新しい触媒法は 追加の反応剤や光を必要とせずに 様々な芳香化合物を効率的に変換します

さらに関連する動画

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
11:45

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles

Published on: August 22, 2018

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions

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関連する実験動画

Last Updated: Jun 5, 2025

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

8.4K
Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
11:45

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles

Published on: August 22, 2018

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Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions
04:38

Preparation of Contiguous Bisaziridines for Regioselective Ring-Opening Reactions

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科学分野:

  • 有機化学
  • カタリシス
  • 材料科学

背景:

  • アロマティック化合物は,安定性と定義された構造のため,化学と材料科学において不可欠である.
  • アロマティック性を破壊するエネルギーコストのため,不活性なアロマティックな炭素-炭素結合を裂くことは困難です.
  • アルケンの転移は非芳香系の強力なツールですが,芳香質への適用は難しかったです.

研究 の 目的:

  • アロマティックな炭素-炭素結合を裂くための触媒的方法を開発する.
  • アロマティック・リング・システムへのメタテシス反応の適用を調査する.
  • アロマティック物質のステレオ選択的変換の可能性を調査する.

主な方法:

  • アロマティック・リング・オープニング・メタテシス (ArROM) のためのシュロック・ホーヴェイダ・モリブデン・触媒を使用した.
  • テトラフェン,ナフタレン,インドル,ベンゾフラン,フェナントレンを含む様々な芳香環系にArROMを適用した.
  • 反応中に形成されたユニークなアルキリデンの中間物質を分析した.

主要な成果:

  • 多様な芳香化合物の割れ方を成功裏に証明した.
  • 各アロマティック・リング・システムに特異なアルキリデン・インターミディエイトを特定した.
  • アトロピゾームの構成に対する触媒制御を示すステレオセレクティブArROMを達成した.

結論:

  • アロマティック化合物を変換するための実行可能で効率的な触媒アプローチを提供します.
  • この方法は,追加の反応剤や光刺激を必要とせずに,様々な芳香質の相互変換を可能にします.
  • この開発は,アロマティック構造の操作と機能化のための新しい道を開きます.